How to update particular array element in MongoDB

Question

I am newbie in MongoDB. I have stored data inside mongoDB in below format

\"_id\" : ObjectId(\"51d5725c7be2c20819ac8a22\"),
\"chrom\" : \"chr22\",
\"pos\" :          


        

Answer 1

You can use the $ positional operator to identify the first array element to match the query in the update like this:

db.VariantEntries.update({
    "pos": 17060409,
    "sampleID": "Job1373964150558382243283", 
    "information.name":"Category"
},{
    $set:{'information.$.value':'11'}
})

Answer 2

In MongoDB you can't adress array values this way. So you should change your schema design to:

"information" : {
    'category' : 3,
    'INDEL' : INDEL
    ...
}

Then you can adress the single fields in your query:

db.VariantEntries.update(
 {
    {"pos" : 117199533} , 
    {"sampleID" : "Job1373964150558382243283"},       
    {"information.category":3}
 },
 {
   $set:{'information.category':'11'}
 }
)